Rotary pump



Nv.1s,19s4. G. J, HARMAN mL 1,980,404

ROTARY PUMP Filed March 19, 1932 INVENTOR.

ATTORNE vso Patented Nov. 13, 1934 UNITED. STATES ROTARY PUMP r Gerald J. Harman and Arthur M. Briggs, Los Angeles, Calif., assignors to Harman Pacific Company, Los Angeles, Calif.

Application March 19,

3 Claims.

Our invention relates to rotary pumps and more particularly to improvements whereby the blades are held yeldingly in engagement with the cylinder wall by means -of expansion rings placed within the inside blade circle at each end of the rotor, thus insuring free movement of the blades at light, even tension between the expansion rings and the pump cylinder, and insuring a better seal between said blades and the cylinder wall.

Another object of our invention is to provide in a rotary pump an improved by-pass valve between the intake and the discharge chambers of the pump, whereby when the discharge outlet is closed or blocked in any way, said by-pass will yield and permit the discharge into the intake passageway, thus providing a safety element in connection with a rotary pump.

Other objects and purposes of our invention will be clear from the following description thereof, taken in connection with the accompanying v drawing in which- Figure 1 is a side or edge elevation of a rotary pump embodying our invention;

Figure 2 is a front elevation of said rotary pump, with parts removed and shown in section to show the interior construction and arrangement;

Figure 2* is a sectional view taken online 2-2 of Fig. 2;

Figure 3 is a sectional view in detail showing a modified form of by-pass valve mechanism; and

Figure 4 is a plan view thereof. I

Referring in detail to the drawing, our rotary pump body 5, has a central bore or cylinder chamber 6, with passageways 7 and 8 connecting with the oppositesides thereof, as indicated, and in the usual and well known manner, one of said passageways serves as intake and the other as discharge.

Mounted through said cylinder chamber 6 is a shaft 9, on which is a rotor 10, eccentrically positioned relative to said cylinder chamber, with radially disposed blades 11, 11, having their outer edges in sealing engagement with the cylinder Wall in a well known manner. An expansion ring 12 is provided around said shaft and bearing against which expansion ring is the inner edge or end of each of said blades, said expansion ring floating in a chamber formed in the end of the rotor and designated 10". It will be understood, as seen in Fig. 2, that the rotor has formed in each end one of these expansion ring chambers 10' and that there is an expansion ring at. each end, against which the opposite ends of each 1932, serial No. 599,968 (c1. 19a-42) blade bear, whereby each blade is yieldingly pressed outwardly at each end. The tension is uniform on each blade and each bladefis held against the wall of the cylinder with a uniform pressure, for the expansion rings move bodily around in their chambers in the ends of the rotor as the blades move in and out radially during the rotation of the rotor. f

Mounted on' the body is, a by-pass body member 13, having a partition 14, dividing it 4into twov passageways '1 5 and 16, which register with thel passageways 7 and 8, respectively. A top cap 17 is l mounted on said member 13, with pipe connections, as 18 and 19, for inilow and exhaust. Screwed into the partition 14 is a valve seat cage 20, within which is valve 21, seating at 22, in said cage 20, and normally held closed by means of a coiled spring 23, .the outer end of which connects with a tension rod or bolt 24, through a plug 25, and provided with a nut 26, as clearly seen in Fig. 2. By adjustment of said nut and bolt, the tension of the spring can be regulated.

Said by-pass body member 13, it will'be noted, -is interposed between the pump body 5 and the cap 17, much as a gasket would be interposed therebetween and inasmuch as it is self -contained or a complete unit, it is made so that it can be reversed so as to change the direction of operation vof the spring pressed valve 21. Thus our device can be inserted when a by-pass is desired, or detached, and can be turned to reverse-the operation of the vby-pass valve. The cap 17 will fit the body when the by-pass body member is removed. Y

In Figs. 3 and 4, we have shown a modified form of yvalve for the by-pass. In these views the partition is designated 14', the valve 21 with seat at 22', said valve having its inner portion inthe form of a cross, as seen in light broken lines in Fig. 4, with a cam ring 27 around the opening through said partition, ksaid cam ring having two circumferentially extending inclined cam edges, as seen, with a ilat spring member extended across the same and designated 28, and secured in its middle to the crossed portions of said valve 21fby means of a top plate 29 and screws 30, as seen in Fig. 4. Said spring `28 yieldingly holds said valve closed, but when pressure on the spring side of the valv is increased beyond normal, said spring will yield and permit said valve to open sufficiently to permit passage through the partition from one side to the other.

AThus we have provided an effective by-pass for a rotary pump which will operate under extreme or excessive pressure to relieve the pump and discharge into The pump bpd# has sun-aplaude plates, as.

5', 5',- with the usual bearingrand bushing, designated 31 and 32, respectively, for the shaft 9.

While we have shown and described the practical embodiment oi our invention, we are aware that changes can be'made as todetails of con-- struction and arrangement without departing from the spirit thereof, and we do not, therefore,

whereby to reverse the direction ot dow between limit the invention to theshowing made, except as we may be limited by thev hereto appended claims.

We claim:

1. A rotary pump including av pump body,

i cap member having means for connecting intake and discharge pipes thereto, said cap being adapt`- tween said/ pipes outside of said pump body, said by-pass mechanism including a spring-pressed valve.

2. A rotary pump ofthe character shown and describedand including in combination a pump body with rotor'therein, a cap tor said body having intake and discharge pipes connected therewith, and a by-pass mechanism, self-contained and adapted to be interposed between said body `and said cap and to be clamped therebetween and having a spring-pressed valve therein adapt.

ed to control communication between said intake and` discharge pipes between the pump and said cap, said by-pass l'mechanism being reversible said intake and said discharge pipes outside of said pump.` f.

`3. In'combinatioma cylinder-'body Ito receive and discharge fluid, inow and outiiow pipes,l

-means in said body for drawing uid in and forcingvit out, means for connecting saidA pipes to,- gether and to said cylinder body, and a bnr-pass mechanism adapted to be clamped between said cylinder body and said means gasket-dike, said by-pass mechanism being reversible as `to position, whereby to change the through said by-pass. .l c GERALD J. HARMAN.

ARTHUR M. BRIGGS..

direction of 110W 

